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May 8th, 2015, 01:43 PM   #1
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square senteces three formulas one task

Task 1.18 F) (r-5s)^2 + 7(2x-3r)^2 - (r-5s)(2s-3r)= 67r^2 - 111rs + 63s^2.
I get confused of the letters and i get bad answers when i try to solve the task.
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May 9th, 2015, 01:27 PM   #2
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Quote:
Originally Posted by Zman15 View Post
Task 1.18 F) (r-5s)^2 + 7(2x-3r)^2 - (r-5s)(2s-3r)= 67r^2 - 111rs + 63s^2.
I get confused of the letters and i get bad answers when i try to solve the task.
You appear to have a typo (x should be s). Could you show your work. The expression is correct.
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May 9th, 2015, 05:23 PM   #3
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Changed your 2x to 2s:
Quote:
Originally Posted by Zman15 View Post
(r-5s)^2 + 7(2s-3r)^2 - (r-5s)(2s-3r) = 67r^2 - 111rs + 63s^2.
I get confused of the letters and i get bad answers when i try to solve the task.
It's all simple squaring and multiplication:
handle it properly and you'll end up with 67r^2 - 111rs + 63s^2 as shown.
We're not here to do your dirty work
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